Trouble creating a furniture family utilizing a Generic Model Adaptive family

[dlafont418837]

Hi,
I'm trying to create a Chesterfield Tub Chair. I've tried to recreate the organic lumps and bumps of a chesterfield using the Generic Model Adaptive family but can't load it into a metric furniture family.
I'd like but I don't know how to combine the seat base with the usual extrusion and sweep commands of a Generic family for the legs.
I've also tried loading a Generic Model Adaptive family it into a concept Mass model and then into my main model it seems to work but does that mean I have to create the whole chair as a Generic Model Adaptive family?
I've also tried using Metric Generic Model Pattern Based family but I again run into a dead end not being able to combine it with the usual extrusion and sweep commands of a Generic family.
Please excuse me if I'm not clear, refer to pictures attached.
Thanks Dean